ATtiny261A datasheet(180/292 Pages) ATMEL

180 / 292 page

180

8197A–AVR–10/09

ATtiny261A/461A/861A

programmed simultaneously. The programming algorithm for the EEPROM data memory is as

follows (refer to “Programming the Flash” on page 177 for details on Command, Address and

Data loading):

1. A: Load Command “0001 0001”.

2. G: Load Address High Byte (0x00 - 0xFF).

3. B: Load Address Low Byte (0x00 - 0xFF).

4. C: Load Data (0x00 - 0xFF).

5. E: Latch data (give PAGEL a positive pulse).

6. K: Repeat 3 through 5 until the entire buffer is filled.

7. L: Program EEPROM page

a. Set BS to “0”.

b. Give WR a negative pulse. This starts programming of the EEPROM page.

RDY/BSY goes low.

c. Wait until to RDY/BSY goes high before programming the next page (See Figure

18-6 for signal waveforms).

Figure 18-6. Programming the EEPROM Waveforms

18.7.7

Reading the Flash

The algorithm for reading the Flash memory is as follows (refer to “Programming the Flash” on

page 177 for details on Command and Address loading):

1. A: Load Command “0000 0010”.

2. G: Load Address High Byte (0x00 - 0xFF).

3. B: Load Address Low Byte (0x00 - 0xFF).

4. Set OE to “0”, and BS1 to “0”. The Flash word low byte can now be read at DATA.

5. Set BS to “1”. The Flash word high byte can now be read at DATA.

6. Set OE to “1”.

RDY/BSY

RESET +12V

0x11

ADDR. HIGH

DATA

ADDR. LOW

DATA

ADDR. LOW

DATA

XA1/BS2

XA0

PAGEL/BS1

XTAL1

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